Device for preparing drinks and method for cleaning such a device

The invention relates to a device for preparing drinks. The invention also relates to a multi-way coupling for use in a device according to the invention. The invention further relates to a method for cleaning a device according to the invention.

Described in the non-pre-published international patent application PCT/NL2008/050068 is a device for cooling drinks, using which device a drink, such as a milkshake, can be cooled quickly and effectively by mixing the drink with a dosed quantity of liquid cryogenic cooling medium, in particular liquid nitrogen. In order to be able to prevent instant freezing of the drink, a vortex is created in the drink by means of stirring during addition of the cooling medium to the drink. In addition to the method of adding the cryogenic cooling medium to the drink, the periodic cleaning of such a device also represents a critical process. There is a need to optimize this cleaning process, whereby cleaning of the supply conduit can take place in relatively simple and efficient manner.

The invention has for its object to provide a device for preparing drinks which can be cleaned in relatively simple and efficient manner.

The invention provides for this purpose a device of the type stated in the preamble, comprising: at least one drink supply container, at least one dosing element which is connected to the drink supply container via at least one supply conduit for the purpose of dosing a quantity of drink, at least one drinking cup holder adapted to releasably hold at least one drinking cup to enable collection of a dosed quantity of drink dispensed by the dosing element, which drinking cup holder is provided with at least one discharge, at least one discharge conduit connected to the discharge of the drinking cup holder, and at least one flushing water supply which is connected to the supply conduit and is closable relative to the supply conduit for the purpose of flushing the supply conduit. By having the flushing water supply connect to the supply conduit for drink and having the discharge conduit connect to the drinking cup holder the device according to the invention, and in particular the supply conduit and the drinking cup holder, can be cleaned in situ in relatively simple manner. The device according to the invention hereby comprises a cleaning circuit, or at least cleaning system, which forms an integral

pan oi me device as sucn, wnereby the device can be embodied structurally m relatively simple and therefore inexpensive manner. Furthermore, a specialist will generally not be required (any longer) to clean the device, because the cleaning of the device could take place completely autonomously using a control unit, which likewise has a favourable effect on operational costs. The flushing water is formed in the first instance by drinking water, which will be advantageous from a financial viewpoint and a health viewpoint. The flushing water in the device can optionally be enriched with a cleaning agent to enable cleaning of the device, wherein the device can optionally also be disinfected as a particular form of cleaning. The preparation of a drink is understood to mean the dispensing of a dosed quantity of drink, in particular a cooled drink. Various drinks can be prepared using the device according to the invention, including milkshakes, alcoholic (mix) drinks, iced drinks, in particular slush puppies, fruit drinks, in particular smoothies, soft drinks, yoghurt, quark cheese, soups and water. It is however also possible to cool soft ice cream using the device according to the invention. Soft ice cream is therefore also deemed to be a drink in the context of this patent publication. For a further specification in respect of the cooling of drinks reference is made to the earlier international patent application PCT/NL2008/050068, the content of which is deemed to be included in this patent publication by way of this reference.

It is advantageous if the dosing element is connected to a closing element to enable substantially liquid-tight closing of the drinking cup holder. The orientation of the drinking cup holder relative to the closing element can preferably be changed between an opened situation positioned at a distance from the closing element, and a closed situation connecting to the closing element. In the opened situation a drinking cup can be positioned in the drinking cup holder and be removed from the drinking cup holder. In the closed situation the flushing water can be injected into the drinking cup holder in relatively efficient manner without the flushing water contaminated with drink residues and the like splashing out of the drinking cup holder. Having the drinking cup receive a dosed quantity of drink, and possibly cooling medium and/or additive, can take place in both the closed situation and in the opened situation. If however the drinking cup holder is provided with a drinking cup, it is not usually possible to close the drinking cup holder, whereby filling of the drinking cup will generally take place in the opened situation of the drinking cup holder. It is generally advantageous to have the flushing water level in the drinking cup holder increase during the process of cleaning the device

in orαer io enaDie improveα cleaning oi the drinking cup holder. More preterably, the drinking cup holder closed by the closing element is substantially completely filled with flushing water in order to enable the best possible cleaning of both (an inside of) the drinking cup holder and (an underside of) the closing element. Allowing the flushing water level to increase in the drinking cup holder can be realized in relatively simple manner by making the speed at which the flushing water is added to the drinking cup holder higher than the speed at which the flushing water is removed from the drinking cup holder. The discharge conduit connected to the drinking cup holder can here be provided with a closing valve to enable (temporary) blocking of the discharge of flushing water from the drinking cup holder, whereby the flushing water level in the drinking cup holder will rise relatively quickly. The closing element is preferably provided here with at least one overflow (connected to a top side of the drinking cup holder) to enable discharge of excess flushing water from the drinking cup holder. Because the flushing water is generally guided under pressure into the drinking cup holder, the flushing water will then also be discharged under pressure via the overflow. The overflow is optionally provided with a non-return valve and the flushing water will generally be drained via the overflow. It is however also possible to envisage the overflow being coupled to the discharge conduit (connected to an underside of the drinking cup holder) in order to allow the flushing water to circulate. The closing element for closing the drinking cup holder is preferably manufactured at least partially from a sealing material, such as for instance an elastomer, in order to limit leakages, and thereby the chance of splashing, as fas as possible. It is however also possible to envisage the drinking cup holder itself being provided with sealing means, such as for instance an elastic upper edge, to which the closing element can connect to enable substantially medium-tight, or at least liquid-tight, closure of the drinking cup holder.

In a preferred embodiment the device comprises at least one stirring element adapted to be positioned at least partially in a space enclosed by the drinking cup holder. The stirring element will generally be adapted primarily, although not necessarily, to be at least partially received in a drinking cup positioned in the drinking cup holder in order to enable active mixing of a dosed quantity of drink with a dosed quantity of cooling medium and/or additive. It is however advantageous if the stirring element is applied for setting into motion flushing water received in the drinking cup holder during cleaning of the device according to the invention. By actively setting and keeping the flushing water

m motion me αnnκing cup noider can be cleaned intensively and completely, this significantly enhancing the cleaning process. In a particular preferred embodiment the closing element for closing the drinking cup holder is adapted to enclose at least a part of the stirring element. The stirring element will here generally be received at least partially in the closing element. This will usually enhance the stability of the stirring element, but also make it possible to keep the applied construction relatively simple. After discharge of the flushing water from the drinking cup holder, the stirring element is preferably dried by (again) rotating the stirring element in the then relatively dry environment in the drinking cup holder, whereby flushing water adhering to the stirring element will be substantially removed from the stirring element as a result of centrifugal forces.

The drink supply container will generally have a limited volume as this is advantageous from the viewpoint of logistics and hygiene. In order to enable the capacity of the device to be to increased, it is advantageous if the flushing water supply is connected to the supply conduit via a (first) multi-way coupling, which first multi-way coupling is adapted for simultaneous coupling to a plurality of drink supply containers. By simultaneously incorporating a plurality of drink supply containers in the device the capacity of the device can be (considerably) increased. By means of the multi-way coupling the supply containers can be coupled successively to the supply conduit, whereby the supply containers can be emptied one after another. Opening and closing of the respective drink supply containers can thus also be regulated using the multi-way coupling. In order to enable facilitated coupling of the drink supply containers to the multi-way coupling, the first multi-way coupling preferably comprises a plurality of respective coupling conduits. The first multi-way coupling preferably also comprises a plurality of respective closing valves to enable selective closure of the coupling conduits, and thereby of the supply containers, relative to the supply conduit. Each closing valve here more preferably comprises sealing means to enable substantially liquid-tight closure of the coupling conduit relative to the supply conduit. The sealing means are here preferably manufactured from an elastomer. In order to enable optimized closure of the coupling conduits it is advantageous when the first multi-way coupling comprises biasing means for urging the closing valves to a position closing the coupling conduits relative to the supply conduit. In this way leakages from the supply containers) to the supply conduit can on the one hand be prevented, while leakages

rrom tne supply conduit to the supply containers) can also be prevented. The latter is particularly relevant in the case flushing water is being carried through the supply conduit, wherein it is undesirable for flushing water to enter one or more coupling conduits closed by the one or more closing elements, which could result in a contamination of the coupling conduits and of the supply containers), and thereby of the device.

In a preferred embodiment the first multi-way coupling comprises an axially rotatable camshaft provided with a plurality of cams, wherein each cam is adapted to operate at least one closing valve. With a differing relative orientation of the cams the closing elements can be operated successively through rotation of the camshaft, whereby the coupling conduits can be successively closed or opened relative to the supply conduit. In this way the different supply containers can thus be emptied successively (in line). This has the additional advantage that the coupling conduits connected to the already emptied supply containers can be opened (also in line) during the cleaning process and then be cleaned using the flushing water, without the risk occurring here that the other coupling conduits connecting to the not yet (fully) emptied supply containers are cleaned. Operation of the camshaft preferably takes place by applying at least one motor. The multi-way coupling will generally also be provided with one or more position sensors for recording the orientation of the cams connected to the camshaft, and thereby the orientation of the closing elements, relative to the coupling conduits. An accurate control of the multi-way coupling can be realized by coupling the motor and the at least one position sensor to a control unit. The first multi-way coupling preferably has a modular construction, wherein each module comprises at least one coupling conduit and at least one closing valve co-acting with the coupling conduit. In this way the number of coupling conduits can be adapted in relatively simple manner to the situational conditions, this imparting a high degree of flexibility to the multi-way coupling.

Although the supply of drink or flushing water to the dosing element could take place on the basis of gravitation, it is generally recommended that the supply conduit is provided with at least one pump for pumping drink or flushing water to the dosing element. By means of a pump the drink or the flushing water can be fed to the dosing element in dosed manner and at a constant flow rate, this enhancing the eventual dosing

oi tne drmlc. it is moreover possible in this manner to ensure that the drink or the flushing water is (forcibly) displaced, whereby disruption of the liquid transport in the device, for instance as a result of possible gas bubbles in the device, can be prevented. In a preferred embodiment the supply conduit is provided with at least one flow meter. The quantity of drink or flushing water displaced through the supply conduit can be recorded relatively accurately per unit time by means of the flow meter. This facilitates the dosing of the drink in the drinking cup on the one hand, while on the other it is in this way possible to determine relatively easily how much flushing water is situated in the drinking cup holder, assuming that the (average) discharge speed of the flushing water from the drinking cup holder is known. It is also possible here to envisage the discharge conduit also being provided with at least one flow meter to enable the flushing water level in the drinking cup holder to be determined relatively precisely. The flow meter is preferably coupled to the pump via a control unit in order to enable regulation of the flow rate of the drink or the flushing water. It is also possible to envisage the pump being provided with a flow meter, whereby the flow meter can form an integral part of the pump.

In a preferred embodiment the flushing water supply is connected to the at least one supply conduit via at least one flushing conduit. The flushing water supply can be formed by the mains water supply. The flushing water supply will however generally comprise at least one supply container, in particular a boiler, to enable a quantity of flushing water to be held in supply and preferably also heated. It will be apparent that the supply container can be connected to the mains water supply in order to enable (discontinuous replenishing of the supply container. The use of a separate flushing conduit generally facilitates the connection of the flushing water supply to the supply conduit and particularly, if applied, to the first multi-way coupling connected to the supply conduit. Through use of the flushing conduit it is moreover relatively easily possible to enrich the flushing water with one or more additives, in particular a cleaning agent. For this purpose the device comprises at least one cleaning agent supply container connected to the flushing conduit. The applied cleaning agent can be of very diverse nature and can for instance be formed by caustic soda or potassium (per)chlorate. In a particular preferred embodiment the at least one discharge conduit is coupled to the flushing conduit. In this way a flushing water circuit is created in the device according to the invention to enable recirculation of flushing water, this

generally Deing particularly advantageous trom an economic, ecological and practical viewpoint.

In a preferred embodiment the supply conduit is provided with at least one conductivity sensor. The ion concentration in the liquid present in the supply conduit can be determined by measuring the electrical conductivity in the supply conduit, whereby the presence of cleaning agent (generally formed by one or more soluble salts) in the supply conduit can be established. It will be apparent that as much as possible, and preferably all, of the cleaning agent must be removed from the supply conduit before a dosed quantity of drink can be dispensed by the device.

The discharge conduit is preferably (also) coupled to a waste container to enable eventual definitive removal of the contaminated flushing water from the supply conduit, the discharge conduit and - if applied - the flushing conduit. The waste container can be formed by a collecting vessel, although it can also be formed by the sewage system. In order to enable regulation of the flow of the flushing water present in the discharge conduit, it is advantageous that the device comprises a second multi-way coupling for selective mutual coupling of the discharge conduit, the supply container for cleaning agent, the waste container and the flushing conduit. In this way it is possible to determine whether the flushing water coming from the discharge conduit must be recirculated or whether this flushing water must be discharged. In the case the flushing water coming from the discharge conduit must be recirculated, it is here also possible using the second multi-way coupling to determine whether or not the flushing water for recirculating must be enriched with additives, in particular cleaning agent.

In a preferred embodiment the dosing element is coupled to at least one additive supply container for enriching a quantity of drink dosed by the dosing element with a dosed quantity of additive. Enriching the drink with the additive could for instance take place in the dosing element. It is however also possible to envisage the additive only being added to the drink in the drinking cup. Examples of possible additives are colouring agents, flavourings, aromatic substances, thickeners, preservatives and so on.

In addition, it is possible to envisage having a cooled drink prepared by the device according to the invention by applying at least one cooling medium supply container

coupieα to ine αosing element lor the purpose oi cooling a quantity of drink dosed by the dosing element using a dosed quantity of cooling medium. The cooling medium is preferably formed here by a cryogenic cooling medium, in particular liquid nitrogen, to enable quick and effective cooling of the dosed quantity of drink, wherein the quantity of cooling medium to be used will be limited. Further details relating to the cooling of drinks by means of a cryogenic cooling medium are described in the earlier international patent application PCT7NL2008/050068.

The invention also relates to a multi-way coupling for use in the device according to the invention. Structural details and the advantageous operation of the multi-way coupling have already been described at length in the above.

In addition, the invention relates to a method for cleaning a device according to the invention, comprising the steps of: A) flushing the supply conduit with flushing water from the flushing water supply, B) collecting in the drinking cup holder flushing water flushed through the supply conduit, and C) discharging collected flushing water from the drinking cup holder. By applying the method according to the invention the supply conduit, the dosing element and the drinking cup holder can be cleaned in relatively simple and efficient manner, this enhancing the cleanness and thereby hygiene of the device. In the case a (first) multi-way coupling is applied, the one or more coupling conduits connected to already emptied drink supply containers can also be opened during the cleaning process, whereby these coupling conduits can also be cleaned.

The method preferably also comprises step D), comprising of closing the drinking cup holder before having the drinking cup holder collect flushing water. Splashing of flushing water and/or other substances from the drinking cup holder, and thereby contamination of the device, can be prevented by closing the drinking cup holder. Closing of the drinking cup moreover makes it possible for the method to also comprise step E), comprising of actively setting into motion flushing water situated in the drinking cup holder after closing of the drinking cup holder as according to step D). Actively setting into motion the flushing water situated in the drinking cup holder preferably takes place by applying a stirring element. It is however also possible to envisage gas bubbles, in particular air bubbles, being blown into the flushing water situated in the drinking cup holder. Actively setting the flushing water into motion

generally increases me ettectiveness ot the cleaning process in substantial manner. From the viewpoint of effectiveness of the cleaning process it is also recommended that the method comprises step F), comprising of heating the flushing water before flushing of the supply conduit as according to step A). The ideal temperature of flushing water depends on the nature of the device, and in particular the nature of the drink used. In the case the drink to be prepared comprises for instance proteins, this being for instance the case in the preparation of milkshakes, it is then recommended that the flushing water is in the first instance no warmer than 40 degrees Celsius in order to prevent solidification (precipitation) of proteins in the device. After flushing out of the proteins, warmer flushing water with a temperature above 40 degrees Celsius can optionally be applied to optimize the final cleaning and possible disinfection of the device.

In a preferred embodiment the method also comprises step G), comprising of adding cleaning agent to the flushing water before flushing the supply conduit as according to step A). The cleaning agent can here have a disinfecting action on the device and thereby enhance the intensity of the cleaning process.

The method according to the invention preferably also comprises step H), comprising of, after discharging collected flushing water from the drinking cup holder as according to step C), flushing the supply conduit again with at least a part of the collected flushing water.

In this way at least a part of the already used (contaminated) flushing water will be recirculated, which will generally be advantageous from an economic, ecological and practical viewpoint.

The method preferably also comprises step I), comprising of measuring the conductivity of flushing water flowing through the supply conduit during flushing of the supply conduit with flushing water as according to step C). The possible presence of cleaning agent can be detected by measuring the conductivity in the supply conduit. The cleaning agent situated in the supply conduit will then be flushed with (clean) flushing water in order to be able to make the device ready for operation in preparing a drink.

I tie method preferably also comprises step J), comprising of, after discharging collected flushing water from the drinking cup holder as according to step C), collecting the flushing water in a waste container. The used (contaminated) flushing water will finally be collected in the waste container, generally formed by a waste vessel and/or a sewer system.

In a particular preferred embodiment of the method according to the invention the method comprises the steps of: K) heating flushing water to a temperature of a maximum of 40 degrees Celsius as according to step F); L) flushing the supply conduit with the heated flushing water as according to step A); M) collecting in the drinking cup holder flushing water flushed through the supply conduit as according to step B); N) discharging collected flushing water from the drinking cup holder as according to step C); O) collecting flushing water discharged from the drinking cup holder in a waste container as according to step J); P) heating flushing water to a temperature of between 50 and 100 degrees Celsius as according to step F); Q) enriching the heated flushing water with at least one cleaning agent as according to step G); R) flushing the supply conduit with the heated flushing water as according to step A); S) collecting in the drinking cup holder flushing water flushed through the supply conduit as according to step B); T) discharging collected flushing water from the drinking cup holder as according to step C); U) again guiding at least a part of the collected flushing water through the supply conduit and the drinking cup holder as according to step H); V) collecting in a waste container flushing water discharged from the drinking cup holder as according to step J); W) flushing the supply conduit with flushing water as according to step A); and X) measuring the electrical conductivity of the flushing water in the supply conduit as according to step I). In this particular preferred embodiment three phases can be distinguished: pre-flushing with lukewarm flushing water formed by steps K) to O); intensive cleaning with warm flushing water formed by steps P) to V); and further flushing formed by step W). Measuring the conductivity in the supply conduit as according to step X) will take place during the further flushing. It is however also possible to envisage measuring of the conductivity as according to step X) being applied in all the above stated phases.

The invention will be elucidated with reference to non-limitative exemplary embodiments shown in the following figures. Herein:

πgure i snows a detailed front view or a part ot an embodiment of a device 1 for preparing drinks according to the invention, figure 2 is a process diagram showing the operation and in particular the cleaning of the device according to figure 1 , and figure 3 shows a cross-section of the first multi-way coupling as used in the device according to figures 1 and 2.

Figure 1 shows a detailed front view of a part of an embodiment of a device 1 according to the invention. Device 1 comprises a thermally insulating cup holder 2, which cup holder 2 is adapted to releasably receive a disposable or more durable drinking cup 3. Device 1 also comprises a stirring element 4 which in the shown situation is positioned partially in drinking cup 3. Device 1 further comprises a dosing element 5, this dosing element 5 being coupled to a supply conduit 6 for drink and to supply conduits (not shown) for cooling medium and additive respectively. The dosing element is adapted for (time-controlled) dosage of a quantity of drink, cooling medium and additive to drinking cup 3. Further details relating to the addition of said components to drinking cup 3 are described in the international patent application PCTVNL2Q08/050068. In this exemplary embodiment cup holder 2, and thereby drinking cup 3, are vertically displaceable along a first guide 7 relative to stirring element 4 and dosing element 5. After preparation of the cooled drink the cup holder 2, and thereby drinking cup 3, will be displaced in downward direction away from stirring element 4 to an intermediate position in which an upper edge 8 of drinking cup 3 is situated (just) lower than stirring element 4. Device 1 also comprises a manipulating element 10 horizontally displaceable along a second guide 9. Manipulating element 10 is adapted as so-called pick & place element and is adapted to engage round drinking cup 3 in said intermediate position such that upper edge 8 of drinking cup 3 will generally rest on manipulating element 10. Drinking cup 3 will be held in this position while cup holder 2 will be displaced further in downward direction to a lowermost position in which an upper edge 11 of cup holder 2 is situated (just) below a lower edge 12 of drinking cup 3. Manipulating element 10 will then generally displace drinking cup 3 in a linear (horizontal) movement to a dispensing opening (not shown) where drinking cup 3, provided with freshly cooled drink, can be taken out of device 1 and can be consumed. As shown, cup holder 2 will be positioned directly below stirring element 4 after removal of drinking cup 3, whereby cup holder 2 is adapted to collect drink residues dripping from stirring element 4. Cup

noiαer i is tneretore provided with a discharge \$ which will be connected to a discharge conduit (not shown) to enable discharge of collected drink residues. If after the preparation of a cooled drink the stirring element 4 and cup holder 2 were to be flushed clean with flushing water optionally provided with a cleaning agent, administered via supply conduit 6 for drink, this flushing water could also be collected by and discharged via cup holder 2. Prior to cleaning, cup holder 2 is herein displaced in upward direction until stirring element 4 is accommodated substantially wholly in cup holder 2. Cup holder 2 is here closed by a closing element 14 connected to stirring element 4 and the (at least one) dosing element 5 in order to be able to minimize splashing of drink residues and cleaning agent outside cup holder 2, and thereby minimize contamination of device 1 as such. An underside of closing element 14, adapted to engage on cup holder 2, is here preferably manufactured from and/or provided with a sealing element in order to be able to realize a substantially medium- tight, in particular substantially liquid-tight closure of cup holder 2. During the cleaning of stirring element 4 it is generally advantageous to rotate stirring element 4, whereby drink residues and cleaning agent will be removed relatively easily from the stirring element and whereby a more intensive cleaning of cup holder 4 will moreover be made possible.

Figure 2 is a process diagram which shows the operation and in particular the cleaning of device 1 according to figure 1. The components shown in figure 2 all form an integral part of device 1, although they are only shown schematically in this figure. In this exemplary embodiment device 1 comprises seven drink supply containers 15, wherein each drink supply container 15 is preferably formed by a so-called bag-in-box, which containers are coupled via a first multi-way coupling 16 to supply conduit 6 for supplying drink to the dosing element 5 connected to closing element 14. The first multi-way coupling 16 comprises a plurality of coupling conduits 17 for coupling drink supply containers 15 to supply conduit 6. Coupling conduits 17 can be closed and opened individually by applying a corresponding number of closing elements 18. In this way drink supply containers 15 can be emptied one by one. Closing elements 18 can be operated via a camshaft 20 driven by an electric motor 19. A structural detail view of the first multi-way coupling 16 is shown in figure 3. Supply conduit 6 for drink is provided with a pump 21 for displacing drink to dosing element 5. Supply conduit 6 is also provided with a conductivity sensor 22 for measuring the electrical conductivity of

πqmα present m supply conduit 0. in this exemplary embodiment device 1 comprises a flushing water supply 23 which is connected to a boiler 25 via a closing valve 24. Boiler 25 is adapted to heat flushing water present in boiler 25 to a predefined temperature. Boiler 25 is provided for this purpose with a heating element 26, a flushing water level sensor 27 and a first thermal switch 28 adapted to switch off boiler 27 when the flushing water has reached a temperature of 40 degrees Celsius, and a second thermal switch 29 adapted to switch off boiler 27 when the flushing water has reached a temperature of 90 degrees Celsius. Device 1 comprises a closing valve 30 for closing off boiler 27 from a flushing conduit 31. Flushing conduit 31 is connected to supply conduit 6 via a safety valve 47 and the first multi-way coupling 16, whereby the first multi-way coupling 16 and supply conduit 6 can be flushed and in this way be cleaned with flushing water. The flushing water is collected in cup holder 2, after which the flushing water is discharged via a discharge conduit 32 connected to cup holder 2. Discharge conduit 32 is connected to the flushing conduit via a second multi-way coupling 33. The second multi-way coupling 33 is also coupled to a waste container 34. In addition, the second multi-way coupling 33 is coupled via a pump 35 to a cleaning agent supply container 36. Apart from the number of couplings, the second multi-way coupling 33 is structurally identical to the first multi-way coupling 16. The flushing water discharged via discharge conduit 32 can be at least partly fed back to flushing conduit 31 by means of the second multi-way coupling 33, wherein the flushing water for recirculation can also be enriched with cleaning agent. By means of the second multi-way coupling 33 it is also possible to collect in waste container 34 the flushing water discharged via discharge conduit 32. Conductivity sensor 22 can detect the presence and the concentration of cleaning agent in supply conduit 6, thereby minimizing the risk of health hazards. Flushing conduit 31 comprises a flow restriction for the purpose of forcing a correct flow direction in flushing conduit 39 (in the direction of supply conduit 6). Device 1 further comprises different additive supply containers 37 for being able to provide the drink with a total of four different flavours. The desired additive can be pumped by means of a pump to dosing element 5, where the dosing of the additive will take place. Since the additives generally consist of sugary liquid substances which have a relatively long shelf life, and wherein the likelihood of deterioration is minimal, the components required for the addition of additive to the drink, except for dosing element 5, do not form part of the cleaning circuit in device 1 according to the invention. By integrating a cleaning circuit into device 1 according to the invention device 1 can be cleaned relatively quickly,

eiiecnveiy ana inexpensively, inis ennancing me reiiaoiπty ana tne auraomty oi αevice 1. During the cleaning closing element 14 is connected to cup holder 2 in preferably substantially liquid-tight manner, whereby particularly supply conduit 4, opened coupling conduits 17, dosing element 5 (or at least a part thereof), cup holder 2 and stirring element 4 can be cleaned intensively. If the device 1 as shown were adapted for the preparation of milkshakes, it could be an option in the cleaning of device 1 to first pre-flush device 1 for several minutes (generally a maximum of 4 minutes) with lukewarm (clean) flushing water at a temperature of 40 degrees Celsius, after which the flushing water will be collected in waste container 34. The second multi-way coupling 33 is preferably closed here, whereby the flushing water level in cup holder 2 will rise until cup holder 2 is substantially completely filled with flushing water. In this way both cup holder 2 and closing element 14 can be cleaned in relatively intensive and substantially complete manner. In order to enable discharge of excess flushing water in this situation, closing element 14 is preferably provided with an overflow 48. Overflow 48 can here take a closable form and/or be provided with a non-return valve to prevent entry of liquid or gas into cup holder 2 via overflow 48. The discharged flushing water will generally be removed from device 1 via overflow 48. After cleaning of cup holder 2 and closing element 14, the second multi-way coupling 33 will be opened, after which discharge of flushing water will take place via discharge conduit 32. Relatively warm flushing water with a temperature of about 90 degrees Celsius and enriched with cleaning agent will then be circulated through the cleaning circuit for several minutes (generally 6 to 7 minutes), after which the contaminated flushing water is collected in waste container 34. After the flushing water has run out of the relevant conduits, device 1 will be flushed further with (clean and relatively cold) cooling water until conductivity sensor 22 detects that all the cleaning agent has been flushed out of supply conduit 6 and that cleaning agent is thus no longer present in supply conduit 6. As shown in figure 2, flushing conduit 31 is provided with a cleaning pump 49, which cleaning pump 49 is connected in parallel with safety valve 47. Cleaning pump 49 is applied to enable selective cleaning of the coupling conduits 17 connected to drink supply containers 15. In general however, cleaning of a coupling conduit 17 takes place only after (substantially) complete emptying of a drink supply container 15 connected to this coupling conduit 17 in order to prevent contamination of the drink (for consumption) received in drink supply container 15. If a drink supply container 15 has been (substantially) wholly emptied, pump 21 will be switched off and cleaning pump

<\ ^y win oe swπcneα on. satety valve 47 will nerem De closed temporarily. Because pump 21 is switched off, supply conduit 6 will in fact be interrupted, as a result of which a pressure will build up between the (switched-on) cleaning pump 49 and the (switched-off) pump 21. By then operating camshaft 20 by means of electric motor 19 such that the coupling conduit 17 connecting to the emptied drink supply container 15 is opened, the relevant coupling conduit 17 can be flushed with flushing water and in this way cleaned. It will be possible to complete the process of cleaning coupling conduit(s) 17 relatively quickly, wherein in this exemplary embodiment cleaning pump 49 is activated three times for ten seconds for selective cleaning of coupling conduits 17. This relatively short-lasting cleaning process is generally, although not necessarily, performed after the other components of device 1, as specified above, have been cleaned. Cleaning pump 49 will be switched off, safety valve 47 will be open and pump 21 switched on during cleaning of these other components of device 1. After cleaning of device 1 , device 1 is once again ready for use in preparing drinks. In this operational state of device 1 the cleaning pump 49 will be switched off and safety valve 47 and the second multi-way coupling 33 will be closed. Safety valve 47 here forms an additional safety provision in the case the second multi-way coupling 33 no longer closes the cleaning agent supply container 36 completely, whereby it is possible in improved manner to prevent cleaning agent being left (during operation) in the first multi-way coupling 16, in supply conduit 6 and therefore ultimately in the drink for consumption.

Figure 3 shows a cross-section of first multi-way coupling 16 as used in device 1 according to figures 1 and 2, wherein it is noted that - for the sake of clarity - the multi- way coupling 16 shown in figure 3 is adapted to couple six conduits, while the actually applied multi-way coupling 16 is adapted to couple nine conduits, which does not otherwise alter the operating principle of multi-way coupling 16. Multi-way coupling 16 comprises an inlet 40 for flushing water and an outlet 41 for respectively flushing water and drink. As shown, all four coupling conduits 17 are closed by closing elements 18 in the shown situation. In order to be able to optimize this closure, each closing element 18 is provided with a top element 42 manufactured from an elastomer. Each closing element 18 is pressed in the direction of the closing position by applying a spring 43. Each closing element 18 is coupled to a pulling frame 44, this pulling frame 44 being adapted to co-act with a cam 45 mounted on camshaft 20. Cam 45 is connected eccentrically to camshaft 20, wherein the mutual orientation of cams 45 relative to

camsnaπ zυ αirrers, wnereoy coupling conduits i / can oe opened successively, AS already stated, camshaft 20 is driven by an electric motor 19. A position sensor 46 records the current position of camshaft 20, and thereby the orientation of closing elements 18 relative to coupling conduits 17. In this way it is possible to record which drink supply containers 15 have or have not already been emptied. Detection of the empty state of a drink supply container 15 generally takes place using a flow meter (not shown) incorporated in supply conduit 6. Multi-way coupling 16 has a modular construction, with four modules in the example shown in figure 3, wherein each module comprises a pulling frame 44, a cam 45, a closing element 18 and a coupling conduit 17. In this way the number of couplings of multi-way coupling 16 can be adapted in relatively simple manner, this enhancing the flexibility of multi-way coupling 16.

It will be apparent that the invention is not limited to the exemplary embodiments shown and described here, but that numerous variants, which will be self-evident to the skilled person in this field, are possible within the scope of the appended claims.